Components of Accumulated Other Comprehensive Loss Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	$ 49,520	$ 58,463	$ 100,304	$ 122,365
Income (loss) from continuing operations before income taxes and equity income (loss)	(13,428)	22,178	(28,042)	47,186
Income tax expense	12,000	7,105	9,834	19,960
Net income (loss)	(24,301)	7,762	(33,893)	23,591
Amount Reclassified from Accumulated Other Comprehensive Loss
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense			(1,776)
Amount Reclassified from Accumulated Other Comprehensive Loss | Cumulative Unrecognized Actuarial Losses on Pension Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from continuing operations before income taxes and equity income (loss)	4,574	5,519	9,224	11,053
Income tax expense	(517)	(469)	(1,034)	(939)
Net income (loss)	4,057	5,050	8,190	10,114
Amount Reclassified from Accumulated Other Comprehensive Loss | Actuarial losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	2,285	3,995	4,661	7,942
Cost of services and products sold	2,229	1,456	4,443	2,974
Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	(3)	31	(4)	62
Cost of services and products sold	63	37	124	75
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense		0
Net income (loss)	(1)	(1)	(258)	(2)
Foreign currency forward exchange contracts | Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenues	0	0	(408)	0
Cost of services and products sold	(1)	$ (1)	(1)	(2)
Income tax expense	$ 0		$ 151	$ 0